linux-6.8/kernel/panic.c

1 // SPDX-License-Identifier: GPL-2.0-only
9  * This function is used through-out the kernel (including mm and fs)
46  * Should we dump all CPUs backtraces in an oops event?
142  * Stop ourself in panic -- architecture code may override this
162  * crash dump, it should save registers of each stopped CPU and disable
163  * per-CPU features such as virtualization extensions.
191  * as saving register state for crash dump.
247  * and then performs the secondary CPUs shutdown - we cannot have
258 	 * situation. If we want to do crash dump after notifier calls  in panic_other_cpus_shutdown()
270  *	panic - halt the system
306 	 * It's possible to come here directly from a panic-assertion and  in panic()
308 	 * preempt to be disabled. No point enabling it later though...  in panic()
335 	if (len && buf[len - 1] == '\n')  in panic()
336 		buf[len - 1] = '\0';  in panic()
338 	pr_emerg("Kernel panic - not syncing: %s\n", buf);  in panic()
341 	 * Avoid nested stack-dumping if a panic occurs during oops processing  in panic()
369 	 * add information to the kmsg dump output.  in panic()
397 	 * panic() is not being callled from OOPS.  in panic()
436 		/* Make sure the user can actually press Stop-A (L1-A) */  in panic()
438 		pr_emerg("Press Stop-A (L1-A) from sun keyboard or send break\n"  in panic()
445 	pr_emerg("---[ end Kernel panic - not syncing: %s ]---\n", buf);  in panic()
463  * TAINT_FORCED_RMMOD could be a per-module flag but the module
489  * print_tainted - return a string to represent the kernel taint state.
491  * For individual taint flag meanings, see Documentation/admin-guide/sysctl/kernel.rst
510 					t->c_true : t->c_false;  in print_tainted()
536  * some notewortht-but-not-corrupting cases, it can be set to true.
576 		/* This CPU may now print the oops message */  in do_oops_enter_exit()
587 			} while (--spin_counter);  in do_oops_enter_exit()
602  * Return true if the calling CPU is allowed to print oops-related info.
611  * Called when the architecture enters its oops handler, before it prints
612  * anything.  If this is the first CPU to oops, and it's oopsing the first
617  * side-effect of preventing later-oopsing CPUs from mucking up the display,
637 	pr_warn("---[ end trace %016llx ]---\n", 0ULL);  in print_oops_end_marker()
641  * Called when the architecture exits its oops handler, after printing
663 			raw_smp_processor_id(), current->pid, file, line,  in __warn()
667 			raw_smp_processor_id(), current->pid, caller);  in __warn()
670 		vprintk(args->fmt, args->args);  in __warn()
736 	memset(__start_once, 0, __end_once - __start_once);  in clear_warn_once_set()
757  * Called when gcc's -fstack-protector feature is used, and
758  * gcc detects corruption of the on-stack canary value
763 	panic("stack-protector: Kernel stack is corrupted in: %pB",  in __stack_chk_fail()
780 		return -EINVAL;  in oops_setup()
785 early_param("oops", oops_setup);
792 		return -EINVAL;  in panic_on_taint_setup()
796 		return -EINVAL;  in panic_on_taint_setup()
798 	/* make sure panic_on_taint doesn't hold out-of-range TAINT flags */  in panic_on_taint_setup()
802 		return -EINVAL;  in panic_on_taint_setup()